MATH 125 LA Valley College Authentic Assessment Error Analysis Exercises


I’m examineing for my Algebra systematize and don’t apprehend how to exculpation this. Can you succor me examine?

RUBRIC:

GRADE (10 points) - 3 points procure be given for opinion fault, 2 points for a close interpretation on why it is incorrect. After posting your retort, 5 points procure be giving for replying to 3 of your systematizemates post.

AUTHENTIC ASSESSMENT: ERROR ANALYSIS

Find the faults, if any, in the subjoined problems; illustrate why it is incorrect:

1. Find the GCF for 108x3y2 and 56x2y4.

108 = 2*54 = 2*2*27 =

2*2*3*9 = 2*2*3*3*3 = 22*33

so 108x3y2 = 22*33 x3 y2

56 = 2*28 = 2*2*14 =

2*2*2*7 = 23 * 7

so 56x2y4 = 23 * 7 x2 y4

The GCF = 23 * 33 * 7 x3 * y4 = 504 x3 * y4

2. Multiply: (2x – 5) (3x2 – 4x + 1) =

6x3 – 8x2 + 2x – 15x2 – 20x – 5 =

6x3 – 23x2 – 18x – 5

3. Factor: 16x2 – y2 = (4x – y)2

4. Factor: 8ax – 4a – 6x + 3 =

4a(2x – 1) + 3(2x – 1) =

(4a + 3)(2x – 1)